Long Distance Struggle

So I've been in a long distance relationship with my boyfriend for about 4 months now. I moved just recently to study but he's in another city. We were close before and would regularly keep in touch but now, that I'm just a few hours away, he seems to not message as much anymore. He works quite a lot but it seems like I'm pulling the weight in this relationship. He's a really great guy but it seems I'm the one who has to message first and ask him how his day went etc.